subsystems icengines
TRANSCRIPT
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Fuel systems for SI engines
Presented by :
Dr. Kamal Kishore Khatri
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Fuel systems for SI engines
• Carburetion:- In the SI engine a combustible fuel airmixture is prepared outside the engine cylinder. Theprocess of preparing this mixture is called carburetionand the device is called carburetor.
• Factors affecting carburetion:-
• The engine speed
• The vapourization characteristics of the fuel
•
The temperature of the incoming air and• The design of the carburetor, intake system and the
combustion chamber.
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• Air fuel mixtures
• Fuel and air are mixed to form three followingtypes of mixtures:-
• Chemically correct mixture
• Rich mixture and• Lean mixture
• The carburetor should provide an A/F ratio in
accordance with engine operating requirements.
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Mixture requirements at different
loads and speeds:-
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Automotive engine air-fuel mixture
requirement
• The carburetor must supply the A/F to satisfy
the following demands:-
• Idling (mixture must be enriched)
• Cruising (Mixture must be leaned)
•
High Power (mixture must be enriched)
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utomot ve eng ne a r- ue m xture
requirement cont.
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r nc p e o ar uret on: mp e
carburetor
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Solex Carburetor
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Conventional fuel supply system for SI
engines
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Petrol Injection:-
• Modern carburetors, have certain drawbacksas given below:-
• In multicylinder engines the mixture supplies
to various cylinders varies in quality &quantity.
• Carburetors do not give free flow passage for
the mixture, so decreases.• It has many wearing parts.
• Freezing may take place at low temperature.
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Petrol Injection cont.
• Surging may take place when it is tilted.
• In petrol engines, the fuel may be injectedduring the suction stroke in the inlet manifold
at low pressures. Two methods of injectionare :
• Continuous injection system
•Timed injection system
• The timing and duration of the fuel injection isdetermined by Electronic control unit (ECU).
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Multi Point fuel injection system
(MPFI)
Port Injection
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Fuel supply system for CI Engines
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Typical fuel feed system for CI Engine
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Injection Systems in CI Engines
b
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Distributor system
l lif
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Fuel lift pump
k f l
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Jerk pump type fuel Injection
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Thank you……..